Browsing by Author "Anis, Pervin"

Now showing 1 - 12 of 12

Dyeing behavior and characterization of recycled cotton and chitosan blended fabrics
(Taylor & Francis Inc, 2022-07-11) Uysal, Serkan; Toprak-Çavdur, Tuba; TOPRAK ÇAVDUR, TUBA; Anis, Pervin; ANİŞ, PERVİN; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi; Bursa Uludağ Üniversitesi/Orhaneli Meslek Yüksek Okulu.; 0000-0001-8475-3197; AAH-3948-2021; B-5740-2017; 0000-0001-8475-3197
The cultivation and wet processing of cotton is very harmful to the environment. Recycling of cotton is an important way to reduce its environmental impact. For this purpose, recycled cotton by using it in a mixture with chitosan yarns and the dyeing behavior of fabrics produced from this blend were examined within the scope of sustainable production. Among the reactive, direct and acid dyeings, the highest color depths were obtained from dyeing with direct dye in alkaline medium and in the presence of salt. It was observed that the dyeing temperature was important for leveling dyeing. The fastness results of reactive dyeing were higher than the others. The FTIR analysis interpreted as that polyester might have been mixed during processing into recycled cotton and the presence of chitosan in the blend could be indicated by decreasing band intensities compared to cotton. The SEM images supported the presence of chitosan in the blended fabric. According to the TGA results, the change in temperature at which the maximum weight loss was observed in the blended fabric approached to that of chitosan. The results showed that chitosan and cotton obtained from recycling could be used as a mixture instead of cotton.
Dyeing behavior of enzyme and chitosan-modified polyester and estimation of colorimetry parameters using random forests
(Korean Fiber Soc, 2023-02-13) Toprak-Çavdur, Tuba; ANİŞ, PERVİN; TOPRAK ÇAVDUR, TUBA; Anis, Pervin; Bakır, Merve; Çavdur, Fatih; ÇAVDUR, FATİH; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Tekstil Mühendisliği Bölümü.; Bursa Uludağ Üniversitesi/Orhaneli Meslek Yüksek Okulu.; 0000-0001-8475-3197; 0000-0003-3300-8773; 0000-0002-9445-6740; AAC-2099-2020; B-5740-2017; JYP-7925-2024
Dyeing of the crystalline structure necessitates a process with a disperse dye either at high temperatures or with a carrier due to its compact and non-ionic structure of polyester. In this study, in order to eliminate these limitations and develop more environmentally friendly dyeing processes, the dyeability of polyester under different conditions with reactive, direct, and acid dyes after surface modifications with enzyme and chitosan was investigated. In addition to the corresponding physical experiments, CIELAB and color strength values were also estimated using random forests. The results of the physical experiments showed that the surface modifications conducted with enzyme and chitosan significantly increased the color depths obtained in dyeing for reactive, direct, and acid dyes, especially at pH 4.5. This was explained by the potentially protonated amine groups in acidic medium of chitosan could have attracted large amounts of anionic dye molecules with physical forces. The highest color depths were obtained from acid dyeing. Washing fastness of the pre-treated and dyed fabrics (except the acid-dyed fabrics) decreased with the shift of the bath pH values to the acidic region. In the next phase of the study, we implemented random forests to estimate CIELAB and color strength values. We considered different random forest designs and trained each design ten times to observe the performance of the corresponding topology. The results of the computational experiments showed that the estimation performance of the random forests is quite satisfactory (with R-values greater than 99%) and random forests could be used to estimate CIELAB and color strength values successfully.
Effect of chemical modification with 4-vinylpyridine on dyeing of cotton fabric with reactive dyestuff
(Springer, 2018-11) Toprak, Tuba; Anis, Pervin; Kutlu, Egemen; Kara, Ali; Uludağ Üniversitesi/Mühendislik Fakültesi/Tekstil Mühendisliği Bölümü.; Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Kimya Bölümü.; 0000-0001-8475-3197; 0000-0003-2457-6314; B-5740-2017; AAH-3948-2021; JKA-6533-2023; AAG-6271-2019; 57191611318; 6505864579; 57203903282; 7102824859
Cotton fabrics were pre-treated with 4-vinylpyridine before dyeing to increase dye uptake. Various treatments for the application of monomers to fabrics were tried in different combinations and after dyeing the best result was obtained with alkali impregnation and monomer exhaustion. After decisions had been made on the processes to be applied before dyeing, different amounts of monomer, dyestuff and salt were used in reactive dyeing baths at different pHs. The results were evaluated in terms of color coordinates, color strength, FT-IR and fastness to washing, rubbing and perspiration. The best results were obtained with 3ml of 4-vinylpyridine dissolved in 10ml of alcohol, in the presence of 25g L-1 of salt and in neutral medium at 5% dyestuff concentration. Color strength from this dyeing process was higher than from the conventional dyeing at the same dyestuff concentration. FT-IR analysis demonstrated the presence of monomer on the surface of the fabric. Fastness values showed that this method could be used as an alternative to the conventional method.
Environmentally friendly reactive washing process: A case study
(Sage Publications Inc, 2022-09-01) Calışkan, Naime; TOPRAK ÇAVDUR, TUBA; ANİŞ, PERVİN; Anis, Pervin; Çalışkan, Naime; Bursa Uludağ Üniversitesi/Orhaneli Meslek Yüksekokulu.; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Tekstil Mühendisliği Bölümü.; 0000-0001-8475-3197; B-5740-2017
Available and clean water resources in the world are decreasing day by day. Textiles is one of the industries that are consuming the highest volumes of water. For this reason, it is necessary to develop environmentally friendly textile processes within the scope of sustainability. Reactive dyeing is followed by a washing process consisting of many steps to remove unfixed/hydrolyzed dyes, which is the most preferred dyeing in the coloring of cotton products. A high amount of water is consumed in these processes. In this study, an alternative washing process was developed instead of the conventional reactive washing process. The baths, which were decided to be used according to the transmittance values of the washing baths after dyeing in light, medium, and dark shades, were used again as the first two baths of the next washings. Alternative washing did not have a negative effect on the quality parameters, namely washing and rubbing fastnesses. As a result, it was observed that the last two baths of the washing cycle could be used as the first two baths of the next washing cycle. In this case, it was predicted that approximately 40%-50% water savings could be achieved.
Enzymatic one - bath desizing - bleaching - dyeing process for cotton fabrics
(Sage Publications, 2009-08) Davulcu, Asim; Eren, Hüseyin Aksel; Anis, Pervin; Uludağ Üniversitesi/Mühendislik Fakültesi/Tekstil Mühendisliği Bölümü.; AAH-3948-2021; 7003950739; 6505864579
The objective of this study was to develop a new process to desize, bleach, and dye starch-sized cotton fabrics in one bath using enzymes. Desizing was performed with an amyloglucosidase/pullanase enzyme (Dextrozyme DX, manufactured by Novozymes) instead of a conventional amylase enzyme in order to hydrolyze starch into single glucose units. Multifect GO 5000L (Genencor) glucose oxidase enzyme was used to yield hydrogen peroxide from the glucose generated during desizing; bleaching was performed by this enzymatically generated hydrogen peroxide. Decomposition of hydrogen peroxide after bleaching was done with Terminox Ultra 10L (Novozymes) catalase enzyme. The fabric was dyed in the same bath with the selected monochlortriazine reactive dyes (DyStar). The amount of glucose generated during desizing was 4000 135 mg/l and it yielded 765 +/- 15 mg/l hydrogen peroxide during glucose oxidase enzyme treatment. The whiteness index of the enzymatically bleached fabric was 71.0 +/- 1.2 stensby degree. The color yields of the enzymatically treated samples were comparable to the conventionally treated samples. All enzymes used in this study were commercial grades having the advantages of easy storage and supply compared to the pure enzymes used in earlier studies. The advantages of the new one-bath process were: less auxiliary demand; lower environmental impact; and energy and water savings compared to the conventional desizing, scouring, bleaching, and dyeing sequence.
Improved antibacterial property of cotton fabrics coated with waste sericin/silver nanocomposite
(Elsevier, 2020-11-01) Gökçe, Yavuz; Aktaş, Zeki; Çapar, Göksen; Kutlu, Egemen; Anis, Pervin; Uludağ Üniversitesi/Fen Bilimleri Enstitüsü/Tekstil Mühendisliği Anabilim Dalı.; FHY-5074-2022; AAH-3948-2021; 57203903282; 6505864579
Sericin is a valuable protein with unique properties, however it is currently discarded as a waste in silk industry, which leads to economic losses and environmental pollution. This study focuses on the utilisation of recovered waste sericin as a potential antibacterial raw material in textile industry for the first time. Waste sericin was used as a reducing and stabilising agent in the production of sericin/silver nanocomposite samples with a binary reducing agent system containing NaOH and NaBH4. The nanocomposite samples were prepared with three different cross-linkers and applied to cotton fabrics at nanocomposite concentrations of 20 g/L and 40 g/L. The antibacterial performance against Escherichia Coli (E. Coli) and Staphylococcus Aureus (S. Aureus) was good; which remained even at the end of 20 wash cycles. The fabrics exhibited better mechanical properties in the presence of cross-linkers.
Investigation of the effects of reactive dyes functionality on dyeing behaviors of fabrics and the environment
(Gazi Univ, Fac Engineering Architecture, 2023-01-01) TOPRAK ÇAVDUR, TUBA; ANİŞ, PERVİN; Anis, Pervin; Çalışkan; Bursa Uludağ Üniversitesi/Orhaneli Meslek Yüksekokulu.; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Tekstil Mühendisliği Bölümü.; 0000-0001-8475-3197; B-5740-2017
Reactive dyes are most commonly used for dyeing of cotton which is the most preferred natural fiber. Although these dyes have many advantages such as wide color gamut, bright colors and being able to be applied in different ways, they have some disadvantages such as losing their dye properties by hydrolysis, remaining hydrolyzate in the liquor and on the fiber surface, and requiring long and costly washing processes to remove hydrolyzates. Various dyes modifications have been conducted within the scope of environmentally friendly production in reactive dyeing. In this study, the dyeing behavior of cotton using dyestuffs with different functional group numbers developed for this purpose and the properties of these dyes in washing wastewater solutions were investigated. The dyeing behaviors of fabrics dyed with reactive dyes with mono-, bi-and tri-functional group numbers were evaluated by colorimeter and color strengths. The absorbance and transmittance measurements of the wastewater of all baths of the reactive washing processes were performed. Despite using dye at the same concentration, higher color depth and similar fastness values were obtained with tri-functional dyes compared to the others. All of the tri-functional reactive washing baths had higher transmittance values than those of the others, except for the first one. It was thought that this could have been explained by the tri-functional dye was fixed to the fiber at a higher rate than the others. In addition, the gradually increasing transmittance values of tri-functional reactive washing wastewater were interpreted as contributing to sustainability by increasing the possibility of reuse of the final wastewater baths or reducing the number of washing baths.
Pamuk liflerinin kitosan ile yüzey modifikasyonu sonrası polielektrolit poli (akrilik asidin sodyum tuzu) varlığında reaktif boyanması
(Bursa Uludağ Üniversitesi, 2022-10-23) Çavdur, Tuba Toprak; Anis, Pervin; Bursa Uludağ Üniversitesi/Orhaneli Meslek Yüksekokulu/Tekstil, Giyim Ayakkabı ve Deri Bölümü.; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Tekstil Mühendisliği Bölümü.; 0000-0001-8475-3197; 0000-0002-6295-637X
Reaktif boyarmaddeler pamuğun boyanmasında en yaygın kullanılan boyarmaddelerdir. Pamuklu kumaşların reaktif boyanması için yüksek miktarda kullanılan elektrolit kaçınılmaz olarak çevresel tehditler oluşturmaktadır. Kitosan üstün özelliklerinden dolayı tekstilde birçok alanda farklı amaçlarla kullanılmaktadır. Bu çalışmada, sentetik polielektrolit poli(akrilik asidin sodyum tuzu) reaktif boyamada inorganik elektrolit sodyum klorür yerine kullanımı ve kitosanın kumaşın reaktif boyama davranışı üzerindeki etkileri araştırılmıştır. Ayrıca kumaşların yıkama haslıkları ve ultraviyole koruma faktörleri de gözlemlenmiştir. Boyamadan önce kitosan ile muamele ve boyamada sodyum klorür kullanımı konvansiyonel boyamalara göre renk derinliklerini arttırmış ve bu artış kitosan konsantrasyonundaki artışla devam etmiştir. Öyle ki, %8 konsantrasyonda kitosan uygulamasını takiben %2 konsantrasyonda yapılan boyamadan, %3 konvansiyonel boyamanın renk kuvvetine benzer değerler elde edilmiştir. Sodyum klorür konsantrasyon artışının renk derinliği üzerindeki etkisi polielektrolitten daha belirgin olarak gözlemlenmiştir. Poli (akrilik asidin sodyum tuzunun) pamuğun reaktif boyamasındaki çalışma prensibinin iyonlaşamaması, sıcaklık-konsantrasyon-pH duyarlılığı ve hidrofobik boya kombinasyonları oluşturması nedeniyle nispeten karmaşık olduğu anlaşılmıştır. Ayrıca boyarmaddelerin farklı tuz duyarlılıklarının da elektrolitlerin etkisinde farklılık yaratmış olabileceği düşünülmüştür. Kitosan aplike edilen ve boyanan numunelerin yıkama haslıkları iyi-mükemmel seviyede iken, kitosan aplikasyonunda kullanılan çapraz bağlayıcının bu değerleri 0,5 puan kadar artırdığı görülmüştür. Boyarmaddelerin ultraviyole koruma faktörünü arttırmada kitosandan daha etkili olduğu gözlemlenmiştir.
Surface trimer removal of polyester fibers by ozone treatment
(Sage Publications, 2009-05) Eren, Hüseyin Aksel; Anis, Pervin; Uludağ Üniversitesi/Mühendislik Fakültesi/Tekstil Mühendisliği Bölümü.; AAH-3948-2021; 7003950739; 6505864579
The oxidative ozone treatment of poly (ethylene terephthalate) fibers after dyeing was recently proposed as a novel afterclearing method. High fastness properties, energy and time savings, and environmental benefits were reported by the ozone treatment compared to the conventional reduction clearing. This study investigated the efficiency of the ozone treatment afterclearing process on the surface trimer removal of poly(ethylene terephthalate) fibers. Results indicated similar cyclic trimer [(GT)(3)] removal rates after 1 min ozone treatment when compared to the conventional reduction clearing; the removal rates increased at 3 min ozone treatment time. The migration rate of the cyclic trimers [(GT)(3)] Out Of the fibers was also investigated as a function of temperature and a sudden increase was observed after second glass transition temperature of poly (ethylene terephthalate) fibers rather than a linear increase.
The effect of enzymatic modification on the dyeability of polyester fabric with reactive dye
(Amer, 2020-11-01) Toprak, Tuba; Anis, Pervin; TOPRAK ÇAVDUR, TUBA; ANİŞ, PERVİN; Bursa Uludağ Üniversitesi; 0000-0001-8475-3197; AAH-3948-2021; B-5740-2017
The inert chemical structure of poly(ethylene) terephthalate (PET) prevents its dyeability with reactive dyes. In this study, the reactive dyeability of polyester fabrics after enzymatic surface modification with different lipases and cutinase was investigated. The reason for the hydrophilicity of the fiber after enzymatic treatment was thought to be functional groups produced after this process, but their peak intensities in Fourier transform infrared spectroscopy (FTIR) were low and shaded by other functional groups. Scanning electron microscopy (SEM) showed that the enzymatic treatment did not cause any surface damage. A slight staining (K/S = 0.30) of the PET fabrics with the reactive dye occurred after enzymatic treatments. Moreover, the fastness to washing and rubbing of the reactive dye stained fabrics were good to excellent.
The effect of enzymatic modification on the dyeability of polyester fabric with reactive dye
(Amer Assoc Textile Chemists Colorists-aatcc, 2020-11-01) Toprak, Tuba; Anis, Pervin; TOPRAK ÇAVDUR, TUBA; ANİŞ, PERVİN; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Tekstil Mühendisliği Bölümü; 0000-0001-8475-3197; B-5740-2017; AAH-3948-2021
The inert chemical structure of poly(ethylene) terephthalate (PET) prevents its dyeability with reactive dyes. In this study, the reactive dyeability of polyester fabrics after enzymatic surface modification with different lipases and cutinase was investigated. The reason for the hydrophilicity of the fiber after enzymatic treatment was thought to be functional groups produced after this process, but their peak intensities in Fourier transform infrared spectroscopy (FTIR) were low and shaded by other functional groups. Scanning electron microscopy (SEM) showed that the enzymatic treatment did not cause any surface damage. A slight staining (K/S = 0.30) of the PET fabrics with the reactive dye occurred after enzymatic treatments. Moreover, the fastness to washing and rubbing of the reactive dye stained fabrics were good to excellent.
The effects of the combined process of enzymatic bleach clean-up, enzymatic defibrillation and dyeing on the comfort and physical properties of tencel/cotton knitted fabrics
(Sage Publications Ltd, 2019-11-11) Sardağ, Sibel; ŞARDAĞ, SİBEL; Toprak, Tuba; TOPRAK ÇAVDUR, TUBA; Anis, Pervin; ANİŞ, PERVİN; Bursa Uludağ Üniversitesi/Ziraat Fakültesi/Tekstil Mühendisliği Bölümü.; 0000-0001-9177-0059; 0000-0001-8475-3197; AAH-3948-2021; B-5740-2017; AAY-8629-2021
This study aimed to investigate the comfort and physical properties of raw and finished knitted fabrics made of yarns with different Tencel/cotton blend ratios. For this purpose, Ne 20 yarns were produced with the same twist coefficient on the same production line. Fabric samples were produced on the same knitting machine. The raw fabrics were subjected to two different combined enzymatic pre-treatments and dyeing processes. In the first process, enzymatic defibrillation and dyeing were carried out in the same bath. In the second, enzymatic bleach clean-up, defibrillation and dyeing were conducted in the same bath. The comfort and physical properties of all the raw and finished fabric samples were measured according to the relevant standards. The results were assessed statistically. The results of this study showed that with increased percentage of Tencel in the blend, the water vapor and air permeability, fabric roughness, pilling, thermal absorption and loss of mass values of the fabrics increased, whereas thermal conductivity values decreased. It was observed that the fabrics which were subjected to enzymatic defibrillation and dyeing processes in a single bath gave lower surface roughness and abrasion values but higher air permeability values; while those subjected to enzymatic bleach clean-up, defibrillation and dyeing in a single bath gave higher thermal conductivity and thermal absorptivity values. Comparison of the two processes showed that there were no significant differences in the pilling and the water vapor permeability values obtained from both processes.